2780039 has 2 divisors, whose sum is σ = 2780040. Its totient is φ = 2780038.

The previous prime is 2779991. The next prime is 2780047. The reversal of 2780039 is 9300872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2780039 - 2⁸ = 2779783 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2779993 and 2780020.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2780339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390019 + 1390020.

It is an arithmetic number, because the mean of its divisors is an integer number (1390020).

2^2780039 is an apocalyptic number.

2780039 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780039 is an equidigital number, since it uses as much as digits as its factorization.

2780039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 2780039 is about 1667.3448953351. The cubic root of 2780039 is about 140.6102443118.

The spelling of 2780039 in words is "two million, seven hundred eighty thousand, thirty-nine".